#introduce .logo {
  display: block;
  height: 20vw;
  background-image: url(./../images/logo.png);
  background-size: 15vw;
  background-repeat: no-repeat;
  background-position: right 2.5vw top 2.5vw;
}

#introduce{
  width: 100vw;
  min-height: 100vh;
  overflow: hidden;
  background-image: url(./../images/introduce.jpg);
  background-size: cover;
}

#introduce h1 {
  text-transform: uppercase;
  text-indent: 2rem;
}

/* 
分条设置
*/
#introduce .container {
  margin-top: 10vh;
}

#introduce .line-bar {
  display: flex;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  align-items: center;
  margin: 5vh 0;
  opacity: 0;
  animation-name:line-bar-anim;
  animation-duration: 0.5s;
  animation-iteration-count: 1;
  animation-timing-function: ease-in-out;
  animation-fill-mode: forwards;
}

@keyframes line-bar-anim{
  form{opacity: 0;}
  to{opacity: 1;}
}

/* 
js
*/
#introduce .line-bar-anmi {
  opacity: 1;
}

/* 
js
*/

#introduce .line-bar:nth-child(2n) {
  flex-direction: row-reverse;
  justify-content: flex-end;
}

#introduce .line-bar:nth-child(2n+1) {
  justify-content: flex-end;
}


/* 
调整间距
*/
#introduce .line-bar:nth-child(2n) .line-bar-rect {
  margin-left: 5vw;
}

#introduce .line-bar:nth-child(2n+1) .line-bar-rect {
  margin-right: 5vw;
}


#introduce .line-circle {
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid white;
  line-height: 2rem;
  text-align: center;
  border-radius: 50%;
}

#introduce .line-circle::before {
  content: "";
  display: block;
  width: 1rem;
  height: 1rem;
  background-color: white;
  border-radius: 50%;
  transform: translate(0.25rem, 0.25rem)
}

#introduce .line-bar-line {
  width: 2.5rem;
  height: .15rem;
  background-color: white;
  margin: 0 0.3rem;
}

#introduce .line-bar-rect {
  width: 11rem;
  font-size: 0.8rem;
  border: 1px solid white;
  border-radius: 5px;
  padding: 0.2rem;
}
